The ornamental design for a twist-tie pod, as shown and described.
FIG. 1 is a front perspective view of a twist-tie pod showing my new design, the broken line showing of the twist tie is to show an environment and forms no part of the claimed design;
FIG. 2 is a bottom perspective view of the article in FIG. 1;
FIG. 3 is a top view of the article in FIG. 1;
FIG. 4 is a bottom view of the article in FIG. 1;
FIG. 5 is a left side view of the article in FIG. 1;
FIG. 6 is a right side view of the article in FIG. 1;
FIG. 7 is a front end view of the article in FIG. 1; and,
FIG. 8 is a back end view of the article in FIG. 1.